3-8
Model 0254
Section 3 Operation
Installation and Operation Manual
X-SE-0254-eng
Part Number: 541B129AAG
September, 2010
PV Signal
This value is the measured electrical value being input into the instrument
channel. It may be used to provide assistance in system installations, and
is used to support instrument calibration. The value displayed is updated in
real time as the value changes.
SP Setpoints
Separate setpoints are provided for rate control (SP Rate), Batch quantity
(SP Batch), and Blend proportion (SP Blend). The specific setpoint shown
on the screen is dependant on the SP Function control type that has been
selected. The value displayed is updated in real time as the value changes.
SP Signal
This value is the output signal being sent form the instruments channel,
and is expressed in the appropriate analog signal type units of Volts or mA.
3-4-2 PV-SP Configuration
The PV and SP channel configuration allows you to program the channel
values to determine how signal inputs and outputs are displayed,
calculated, operated, and scaled. These values are programmed in the
Channel Instrument Configuration screen. For more information, refer to
"3-6 Process Controls" on p. 3-15, which describes in greater detail the
setup, configuration, operation, and termination of control processes.
The PV and SP program values are used to determine the following
channel attributes:
•
Gas type service
•
Channel override signal
•
PV signal type and full scale range
•
SP signal type and full scale range
•
Channel service function
•
Channel override signal
•
SP values
•
SP programming source
The PV and SP values are static and are updated only after a value has
been changed and saved.
